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Most USB drives will automount under the Ubuntu operating system. Automounting means Ubuntu is programmed to automatically recognize the storage device plugged into the system and place it in the /media directory, open a file browser window for the volume and place an icon for the volume on your desktop. In the circumstance that Ubuntu is unable to automount the USB drive, manual mounting the drive is possible using the steps outlined below.
1.Plug the USB drive into the computer. Ubuntu should mount the device automatically. If no volume appears under the /media directory continue to Step
2.Click on Applications -> Accessories -> Terminal.
Type "sudo fdisk -l" and hit the enter key.
Find your device in the list. It will look something like: /dev/sdb1
Type "sudo mkdir /media/external" into the terminal window and hit the enter key.
If the filesystem is formatted as FAT16 or FAT32, type "sudo mount -t vfat /dev/sdb1 /media/external -o uid=1000,gid=100,utf8,dmask=027,fmask=137" into the terminal window, and hit the enter key. Otherwise, if the device is formatted with NTFS, type "sudo mount -t ntfs-3g /dev/sdb1 /media/external" and hit the enter key.
To unmount the device, type "sudo umount /media/external" into the terminal window and hit the enter key.
How to Mount a USB Drive in Ubuntu
原文：http://www.cnblogs.com/cj2014/p/4538944.html